If I have an IEnumerable data structure called myIEnumerable, how can I check if its type is List?

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var myList = myIEnumerable as List ?? myIEnumerable.ToList();

var myList = myIEnumerable is List ? myIEnumerable.ToList();

var myList = myIEnumerable is List ?? myIEnumerable.ToList();

var myList = myIEnumerable as List ? myIEnumerable.ToList() : myIEnumerable;

The as operator is used to perform certain types of conversions between compatible reference or nullable types